import math;
n = int(input())
for i in range(1,n+1):
     for j in range(1,n-i+1):
          print(' ',end='')
     for k in range(1,2*i):
          print(chr(int(math.fabs(k-i))+65),end='')
     print()
/**************************************************************
	Problem: 1096
	User: admin
	Language: Python
	Result: Accepted
	Time:90 ms
	Memory:34480 kb
****************************************************************/